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Property and Equipment - Depreciation and Amortization on Property and Equipment Using the Straight-Line Method (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property Plant And Equipment [Abstract]    
Office furniture and fixtures $ 1,650 $ 1,650
Software 5,004 4,379
Equipment 4,967 5,041
Leasehold improvements 1,658 1,721
Gross property and equipment 13,279 12,791
Less accumulated depreciation and amortization (10,007) (9,141)
Property and equipment, net $ 3,272 $ 3,650